The aim of this study was to investigate the effectiveness of supervised exercise training during post surgery radiotherapy period on range of motion, grip strength, scapular dyskinesia, lymphedema, upper extremity functionality, fear of movement, quality of life, pain and sensory symptoms. Thirtyseven patients who underwent unilateral breast and axilla surgery and referred to axillary radiotherapy were allocated in two groups as exercise (n = 19) and control (n= 18) by simple random method. The patients in exercise group received, range of motion, stretching, strengthening, breathing, neural mobilization exercises and manuel therapy applications, 3 days a week for 7 weeks. The patients in the control group didn’t receive any exercise training as in routine radiotherapy period. The patients in both groups were evaluated before and after radiotherapy period for shoulder range of motion with universal goniometer, grip strength with Jamar hand dynamometer, scapular dyskinesia with Lateral Scapular Slide Test, lymphedema with circumferencial measurement, functionality with Disabilities of the Arm, Shoulder and Hand Questionnaire (DASH) and Shoulder Pain and Disability Index (SPADI), fear of movement with TAMPA Kinesiophobia Scale , quality of life with European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire C30 and BR23 (EORTC QLQ C30 and BR23), pain and sensory symptoms with McGill Pain Questionnaire and the Visual Analogue Scale (VAS). According to our results; while shoulder ROM increased in all directions in exercise group (p0.05). For quality of life subscale results; breast symptoms increased in both groups (p0.05), all the other quality of life parameters was decreased (p0,05). Yaşam kalitesi alt ölçeklerinde, meme semptomlarında her iki grupta da artış gözlendi (p0,05), diğer tüm alt parametrelerde azalma gözlendi (p